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苏香林,孙长波,许庆彦,柳百成.低Re镍基单晶高温合金平衡相析出行为的热力学模拟计算[J].稀有金属材料与工程(英文),2017,46(12):3699~3714.[Su Xianglin,Sun Changbo,Xu Qingyan,Liu Baicheng.Thermodynamic Simulation Calculation on Precipitation Behavior of Equilibrium Phases in a Low Re-bearing Nickel-based Single Crystal Superalloy[J].Rare Metal Materials and Engineering,2017,46(12):3699~3714.]
Thermodynamic Simulation Calculation on Precipitation Behavior of Equilibrium Phases in a Low Re-bearing Nickel-based Single Crystal Superalloy
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Received:March 31, 2017  Revised:September 28, 2017
DOI:
Key words: single crystal superalloy  DD6  equilibrium phases  thermodynamic calculation  Pandat
Foundation item:国家自然科学(51374137和51171089);国家科技重大专项(2012ZX04012-011);国家重点基础研发项目(2011CB706801)
Author NameAffiliationE-mail
Su Xianglin Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University suxianglin2005@sina.com 
Sun Changbo Aero Engine Corporation of China AECC Shenyang Liming Aero-Engine Group Corporation Ltd sunchangbo@126.com 
Xu Qingyan Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University scjxqy@tsinghua.edu.cn 
Liu Baicheng Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,School of Materials Science and Engineering,Tsinghua University liubc@tsinghua.edu.cn 
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Abstract:
      Based on thermodynamic calculation Pandat software and PanNi database, thermodynamic phase equilibrium calculation method was employed to investigate the effect of alloying composition on precipitation behavior of equilibrium phases in a low Re-containing nickel-based single crystal superalloy DD6. Results indicate that the equilibrium phases consist of γ, γ′, μ, MC and M23C6, and the calculated results are in excellent agreement with the experimental results. The Al, Ta and Nb content mainly control the mass fraction of γ′ precipitates. With increase of Al, Ta and Nb content, the mass fraction of γ′ precipitates is significantly enhanced, the solution temperature of γ′ precipitates is obviously increased, and the liquid starting and finishing solidification temperature is gradually decreased. The C content determines the precipitation amount of MC and M23C6. Increment of C content results in more precipitation of carbides. The precipitation of μ phase is predominantly influenced by Re, W, Mo and Cr. With the increase of Re, W, Mo and Cr content, the initial precipitation temperature of μ phase is significantly enhanced, the maximum precipitation amount of μ phase is obviously increased, and the precipitation temperature range of μ phase is markedly extended.